640702586880 has 784 divisors, whose sum is σ = 2363673708000. Its totient is φ = 166546243584.

The previous prime is 640702586791. The next prime is 640702586891. The reversal of 640702586880 is 88685207046.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1283972871 + ... + 1283973369.

Almost surely, 2^640702586880 is an apocalyptic number.

640702586880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640702586880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181836854000).

640702586880 is an abundant number, since it is smaller than the sum of its proper divisors (1722971121120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640702586880 is an frugal number, since it uses more digits than its factorization.

640702586880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 640702586880 in words is "six hundred forty billion, seven hundred two million, five hundred eighty-six thousand, eight hundred eighty".